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A multi-stage vacuum adiabatic flash continuous crystallization method and equipment

A vacuum adiabatic and flash evaporation technology, applied in the field of multi-stage vacuum adiabatic flash continuous crystallization process, continuous crystallization equipment, multi-stage vacuum adiabatic flash continuous crystallization method and equipment, can solve the impact of continuous operation of the device and slurry mixing Variation, crystal particle size and other problems, to achieve the effect of improving production efficiency, reducing the number of equipment, and maintaining stable particle size

Active Publication Date: 2018-06-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of external circulation cooling in the equipment, its cooling pipes are relatively easy to foul, which affects the continuous operation of the device
And because there is no stirring inside the crystallizer, it may make the mixing of the slurry worse, thus making the crystal size worse

Method used

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  • A multi-stage vacuum adiabatic flash continuous crystallization method and equipment
  • A multi-stage vacuum adiabatic flash continuous crystallization method and equipment
  • A multi-stage vacuum adiabatic flash continuous crystallization method and equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 Shown, a continuous vacuum adiabatic flash evaporation continuous crystallizer. There is a thermal insulation layer 2 outside the crystallizer. The diameters of the upper and lower straight cylinders of the crystallizer are different. The diameter of the upper part is larger than that of the lower part. The diameter of the upper straight cylinder is 3.5 meters. The height of the segment is 2 meters. The hot material enters the inside of the guide tube 6 from the feed port 3, and is stirred by a double-layer large-diameter stirring paddle 7. The height of the guide tube is 1.7 meters, the diameter of the guide tube is 1.83 meters, and the diameter of the stirring paddle is It is 1.8 meters. The mixing in the crystallizer is uniform, and there is a spray pipe 1 on the upper part of the crystallizer for spraying the inner wall of the crystallizer to remove the knot wall at the evaporation surface. The evaporated water in the crystallizer is condensed by...

Embodiment 2

[0048] Such as figure 2 Shown is a vacuum adiabatic flash evaporation continuous crystallization process; two crystallizers are connected in series. The top of the crystallizer is connected with a condenser and a water ring vacuum pump; the lower part of the crystallizer is equipped with a turbidimeter. The material inlet of each level of crystallizer is located at the bottom of the guide tube, which is higher than the stirring paddle of the lower layer; the material outlet is located at the bottom of the crystallizer; the discharge pipe of the last stage of crystallizer is connected to the centrifuge. The concentration in the storage tank 10 is 17%, and the sodium hydrogen phosphate mother liquor with a temperature of 80 degrees is entered into the first-stage crystallizer 12 by the centrifugal pump 11 according to the flow rate of 7m3 / h, and the first-stage crystallizer 12 is controlled by controlling the power of the water ring vacuum pump 15. The degree of vacuum in the ...

Embodiment 3

[0050] Such as image 3 Shown is a vacuum adiabatic flash evaporation continuous crystallization process; four crystallizers are connected in series. The top of the crystallizer is connected with a condenser and a water ring vacuum pump; the lower part of the crystallizer is equipped with a turbidimeter. The material inlet of each level of crystallizer is located at the bottom of the guide tube, which is higher than the stirring paddle of the lower layer; the material outlet is located at the bottom of the crystallizer; the discharge pipe of the last stage of crystallizer is connected to the centrifuge. The concentration in the storage tank 10 is 23%, and the sodium hydrogen phosphate mother liquor with a temperature of 90 degrees is entered into the first-stage crystallizer 12 by the centrifugal pump 11 according to the flow rate of 7m3 / h, and is controlled by controlling the power of the water ring vacuum pump 15 The degree of vacuum in the first-stage crystallizer makes th...

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Abstract

The invention relates to a multi-stage vacuum adiabatic flash continuous crystallization method and equipment. Multiple crystallizers are connected in series; each crystallizer comprises an upper straight cylinder section and a lower straight cylinder section, the diameter of the lower straight cylinder section is smaller while the diameter of the upper straight cylinder section is larger, the two sections of straight cylinders are connected through a reducing nipple, the upper straight cylinder section is short while the lower straight cylinder section is long, the bottom of the crystallizer is W-shaped, a guide cylinder is arranged in the lower straight cylinder section of the crystallizer, a stirring motor is located at the top of the crystallizer, a double-layer stirring paddle is used for stirring, the diameter of the stirring paddle is smaller than that of the guide cylinder, the top-layer stirring paddle is higher than the guide cylinder, and the bottom-layer stirring paddle is located at the lower part of the guide cylinder. The content of solids in a first-stage crystallizer is controlled to range from 3% to 10%; the content of solids in a second-stage crystallizer ranges from 10% to 20%; the content of solids in a third-stage crystallizer ranges from 20% to 30%; the content of solids in a fourth-stage crystallizer is lower than or equal to 50%. Produced crystals are uniform in particle size and better in appearance, and the particle size of the crystals is larger and stable; the production efficiency of the continuous crystallization technology is improved.

Description

technical field [0001] The invention relates to a continuous crystallization process, in particular to a multi-stage vacuum adiabatic flash evaporation continuous crystallization process, and continuous crystallization equipment for realizing the process; in particular to a multi-stage vacuum adiabatic flash evaporation continuous crystallization method and equipment. Background technique [0002] In chemical production, the crystallization process is roughly divided into two forms: continuous crystallization and batch crystallization. The batch crystallization process is a crystallization process in which raw materials are added at one time, then crystals are obtained through different crystallization methods, and the crystals are separated from the mother liquor for the last time. Due to the defects of its operation mode, the quality of the product depends very much on the experience of the operator, which often leads to problems such as uneven crystal thickness and diffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/06B01D9/02
CPCB01D3/06B01D9/0022
Inventor 龚俊波张得江张美景侯宝红尹秋响王静康
Owner TIANJIN UNIV